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The cumulative lag effects on the COVID-19 case doubling time with the 10th percentile (a, b, c) and the 90th percentile (d, e, f) of meteorological factors under different lag exposure periods (lag 03, lag 05, lag 07, lag 09, lag 011 and lag 014). Total: a meta-analysis of relative risk across four countries; DTR, diurnal temperature range.
